well in that case i'll probably use the pulsating core, its got a power of 988 and dragon power of 350 and reaches white sharpness with sharpness+1 (the hammer i was going to use had a power of 988 anyway)

Alatreon has different sets of weaknesses based on the "mode" or "color of his scales"

When Alatreon has red scales and is primarily using ground based moves Alatreon is weak to Ice (the most) and Water (second) but when Alatreon has Blue Scales and is flying constantly then Alatreon is weak to Dragon (the most) and Fire (second).